IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.151.2.128/26

network10.151.2.128/26

broadcast10.151.2.191

first host10.151.2.129

last host10.151.2.190

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classA

ipcalc 10.151.2.128/26

address00001010.10010111.00000010.10000000

subnet mask11111111.11111111.11111111.11000000

network00001010.10010111.00000010.10000000

broadcast00001010.10010111.00000010.10111111

green = network part, grey = host part

hex0x0a970280

decimal177668736

reverse dns128.2.151.10.in-addr.arpa

ipv4-mapped::ffff:a97:280

/26 split into /31 · 32 subnets

close ×

#	network	host range	broadcast
1	10.151.2.128/31	10.151.2.128 – 10.151.2.129	10.151.2.129
2	10.151.2.130/31	10.151.2.130 – 10.151.2.131	10.151.2.131
3	10.151.2.132/31	10.151.2.132 – 10.151.2.133	10.151.2.133
4	10.151.2.134/31	10.151.2.134 – 10.151.2.135	10.151.2.135
5	10.151.2.136/31	10.151.2.136 – 10.151.2.137	10.151.2.137
6	10.151.2.138/31	10.151.2.138 – 10.151.2.139	10.151.2.139
7	10.151.2.140/31	10.151.2.140 – 10.151.2.141	10.151.2.141
8	10.151.2.142/31	10.151.2.142 – 10.151.2.143	10.151.2.143
9	10.151.2.144/31	10.151.2.144 – 10.151.2.145	10.151.2.145
10	10.151.2.146/31	10.151.2.146 – 10.151.2.147	10.151.2.147
11	10.151.2.148/31	10.151.2.148 – 10.151.2.149	10.151.2.149
12	10.151.2.150/31	10.151.2.150 – 10.151.2.151	10.151.2.151
13	10.151.2.152/31	10.151.2.152 – 10.151.2.153	10.151.2.153
14	10.151.2.154/31	10.151.2.154 – 10.151.2.155	10.151.2.155
15	10.151.2.156/31	10.151.2.156 – 10.151.2.157	10.151.2.157
16	10.151.2.158/31	10.151.2.158 – 10.151.2.159	10.151.2.159
17	10.151.2.160/31	10.151.2.160 – 10.151.2.161	10.151.2.161
18	10.151.2.162/31	10.151.2.162 – 10.151.2.163	10.151.2.163
19	10.151.2.164/31	10.151.2.164 – 10.151.2.165	10.151.2.165
20	10.151.2.166/31	10.151.2.166 – 10.151.2.167	10.151.2.167
21	10.151.2.168/31	10.151.2.168 – 10.151.2.169	10.151.2.169
22	10.151.2.170/31	10.151.2.170 – 10.151.2.171	10.151.2.171
23	10.151.2.172/31	10.151.2.172 – 10.151.2.173	10.151.2.173
24	10.151.2.174/31	10.151.2.174 – 10.151.2.175	10.151.2.175
25	10.151.2.176/31	10.151.2.176 – 10.151.2.177	10.151.2.177
26	10.151.2.178/31	10.151.2.178 – 10.151.2.179	10.151.2.179
27	10.151.2.180/31	10.151.2.180 – 10.151.2.181	10.151.2.181
28	10.151.2.182/31	10.151.2.182 – 10.151.2.183	10.151.2.183
29	10.151.2.184/31	10.151.2.184 – 10.151.2.185	10.151.2.185
30	10.151.2.186/31	10.151.2.186 – 10.151.2.187	10.151.2.187
31	10.151.2.188/31	10.151.2.188 – 10.151.2.189	10.151.2.189
32	10.151.2.190/31	10.151.2.190 – 10.151.2.191	10.151.2.191

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /26
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →